import functools

from flask import g
from flask import session


def do_index_class(index):
    '''
    自定义过滤器,过滤点击排序class
    :param index:
    :return:
    '''
    if index == 0:
        return 'first'
    elif index ==1:
        return 'second'
    elif index ==2:
        return 'third'
    else:
        return ''

def user_login_data(f):
    @functools.wraps(f)
    def wrapper(*args,**kwargs):
        user_id = session.get('user_id')
        user = None
        if user_id:
            from info.models import User
            user = User.query.get(user_id)
        g.user = user
        return f(*args,**kwargs)
    return wrapper